A sound quality-based investigation of the HVAC system noise of an automobile model

Leite, Ricardo Penna; Paul, Stephan; Gerges, Samir N. Y.

doi:10.1016/j.apacoust.2008.06.010

Cited by 48 publications

(22 citation statements)

References 1 publication

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“…As shown in Figure 7(a-d), in all four sound quality indices, including loudness, sharpness, roughness and fluctuation strength, there exist remarkable differences between the trial production and competitor vehicles. 16 As a result, sound quality objective test results are identical to the subjective scores, as shown in Table 3.…”

Section: Sound Quality Analysismentioning

confidence: 53%

Diagnosis and analysis of abnormal noise in the pure electric vehicle’s air condition compressor at idle

Zhiwei

Yigang

2018

Journal of Low Frequency Noise, Vibration and Active Control

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A pure electric vehicle may produce an abnormal 'clicking noise' when idling, especially as start-up, which can be a serious problem in terms of product performance. In this paper: (1) professional evaluators carry out subjective evaluations and the abnormal noise-generation mechanism and its transfer path are analysed; (2) the mode shape and sound pressure distribution are both simulated using the finite element method; (3) the AC compressor's sound source is identified and located in the main frequency domain using the acoustic array and image formation method, so vibration and interior vehicle noise measurements from the compressor are carried out; and (4) based on the established causes of the abnormal noise, three effective approaches-structure reinforcement, manufacturing process improvement and start-up control optimization-are presented to help prevent abnormal noises from the AC compressor.

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Section: Sound Quality Analysismentioning

confidence: 53%

Diagnosis and analysis of abnormal noise in the pure electric vehicle’s air condition compressor at idle

Zhiwei

Yigang

2018

Journal of Low Frequency Noise, Vibration and Active Control

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“…Under these conditions, the contribution of the noise due to HVAC system is very significant to the acoustical comfort of the passenger. The passenger comfort can be further influenced due to the interaction of temperature and the noise levels inside the vehicle [1][2].…”

Section: Introductionmentioning

confidence: 99%

Influence of Air Conditioning Characteristics on Vehicle Interior Noise

Hammad

2010

Int. J. Vehicle Structures and Systems

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Reduction of Heating, Ventilation and Air Conditioning (HVAC) systems and other components such as engine and exhaust system has resulted the study on the vehicle noise as an increasingly important aspect for the automotive industry in meeting the passenger comfort requirements. In this paper, the influence of vehicle air conditioning characteristics such as the fan speed, engine speed and air conditioning positions (i.e., ON or OFF) on the vehicle interior Sound Pressure Level (SPL) is presented. The generation of noise and its transmission mechanisms are studied. The major contributors to the HVAC system airborne noise are the aerodynamic, mechanical and hydraulic noises from the compressor and handling units. Since the HVAC's fan is driven directly by the vehicle battery that is separated from the HVAC, the noise generation due to the fan speeds or positions can be directly obtained by turning the compressor to OFF and the fan to ON positions. Meanwhile, the mechanical and hydraulic noises can be obtained by extracting the airborne noise by turning the compressor to OFF and the fan to ON positions from those obtained by turning both the compressor and fan to ON position. The experimental results indicate that the principal source of vehicle noise is related to the aerodynamic noise and the noise level has shown considerable increase when both the fan and compressor units are turned to ON positions. For a specific fan speed, an increase in the noise due to the mechanical and hydraulic sources is observed for an increase in the engine speed. KEYWORDS: Vehicle interior noise, Sound pressure level, Vehicle cavity, Natural frequencies CITATION: N. Hammad. 2010. Influence of air conditioning characteristics on vehicle interior noise, Int. J. Vehicle Structures & Systems, 2(2), 80-86.

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“…On the other hand, another typical method is based on listening tests in combination with the application of questionnaires. [22][23][24][25] Different kinds of questionnaires and different scales of evaluation were used in the existing studies. 1,3,5,26 However, to standardize the evaluation of the response to noise, the International Commission of the Biological Effects of Noise (ICBEN) established a method based on a survey that was developed in different languages.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Psychoacoustic Annoyance and Perception of Noise Annoyance Inside University Facilities

Hernández¹,

García²,

Navarro³

et al. 2018

IJAV

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The levels of noise produced in university facilities by students, increases the noise annoyance. The quality of life and the academic performance of university students could be inuenced by this factor. Unfortunately, as far as methodology is concerned, there are no regulations or standards that allow for the correct evaluation of noise annoyance at educative facilities. In this work a method for the evaluation of noise annoyance and an indicator of noise annoyance are presented. In order to obtain a numerical value, a percentage index, and a verbal index that represents the noise annoyance in a specific area at university facilities, psychoacoustic annoyance (PA) and evaluation of perception of noise annoyance has been related. Resulting from this correlation an indicator of noise annoyance was proposed. The results were associated with this indicator. The method and the proposed indicator allow for deeper evaluation of noise annoyance and facilitate the development of appropriate actions against noise.

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A sound quality-based investigation of the HVAC system noise of an automobile model

Cited by 48 publications

References 1 publication

Diagnosis and analysis of abnormal noise in the pure electric vehicle’s air condition compressor at idle

Diagnosis and analysis of abnormal noise in the pure electric vehicle’s air condition compressor at idle

Influence of Air Conditioning Characteristics on Vehicle Interior Noise

Evaluation of Psychoacoustic Annoyance and Perception of Noise Annoyance Inside University Facilities

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